linux-kernel - Re: [PATCH V2] Keep 3 high personality bytes across exec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 30 Jun 2008 08:56:30 -0700
From:	Eric B Munson <ebmunson@...ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] Keep 3 high personality bytes across exec

On Mon, 30 Jun 2008, Paul Mackerras wrote:

> Eric B Munson writes:
> 
> > --- a/include/asm-powerpc/elf.h
> > +++ b/include/asm-powerpc/elf.h
> > @@ -257,7 +257,8 @@ do {								\
> >  	else							\
> >  		clear_thread_flag(TIF_ABI_PENDING);		\
> >  	if (personality(current->personality) != PER_LINUX32)	\
> > -		set_personality(PER_LINUX);			\
> > +		set_personality(PER_LINUX |			\
> > +			(current->personality & PER_INHERIT));	\
> 
> Couldn't we use ~PER_MASK here instead of PER_INHERIT?  That would
> mean we wouldn't have to modify include/linux/personality.h, and we
> wouldn't have to keep updating PER_INHERIT as more flags get added.
> 
> (Nice patch description, BTW.  Thanks.)
> 
> Paul.
> 

Yeah, ~PER_MASK will work fine.  I used PER_INHERIT first because I
was not sure if there were values that should not be carried forward.
I will have an updated patch out shortly.

Eric

Download attachment "signature.asc" of type "application/pgp-signature" (190 bytes)